US3700816A - Telemetering remote recording unit - Google Patents

Telemetering remote recording unit Download PDF

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US3700816A
US3700816A US103067A US3700816DA US3700816A US 3700816 A US3700816 A US 3700816A US 103067 A US103067 A US 103067A US 3700816D A US3700816D A US 3700816DA US 3700816 A US3700816 A US 3700816A
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signal
control
terminal
points
shift register
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Ross Hugh Evans
Daniel Arron Seltzer
Robert Leonard Young
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GAMON CALMET IND Inc
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GAMON CALMET IND Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/002—Telephonic communication systems specially adapted for combination with other electrical systems with telemetering systems

Definitions

  • the number in the storage re- [22] Filed; Dec. 31, 1970 gister is called up by an automatic calling unit and pulsed out onto a switched telephone network.
  • the [2]] App! 103967 switched telephone network activates a meter reading circuit at an appropriate location represented by the 1 52] US. Cl ..179/2 DP, 340/172.5, 340/151 telephone number-
  • the meter reading circuit [51] Int. Cl.
  • PATENIEnncr24 m2 SHEET 2 [1F 4 PATENTEDBBT24 m2 3.700.816 saw u er 4 ATTORNEYS 1 TELEMETERING REMOTE RECORDING UNIT FIELD OF THE INVENTION BACKGROUND OF THE INVENTION
  • Most buildings in the United States are provided utilities on a metered basis.
  • water for example, is supplied by a utility company. The water passes through a water meter into each building or portion thereof so that information for billing each customer may be obtained.
  • a meter reader periodically visits each location where a meter is located to read the meter.
  • a high speed computer as the central accessing terminal presents an additional problem because information received at high speeds must be stored on tape, discs or other high speed storage devices which are serial in nature.
  • a sorting step is normally employed searching through all the received data for various catagories or responses. For example, a search would first be initiated for busy signals, for no answers, etc. This search increases the cost of the system to the user because expensive equipment (ie a computer) is needed to sort such serially stored data.
  • the present invention contemplates a system in which information is retrieved selectively from a plurality of utility meters connected to numbered telephone lines.
  • a single storage register is employed for l) presenting the telephone number of a meter to be interrogated to an automatic calling unit and (2) receiving and holding the information sent back from the interrogated meter for presentation to a card duplicator.
  • the telephone number of the meter to be interrogated is presented to the storage register by the card duplicator during a card duplicating operation.
  • the information received back and held in the storage register is presented to the card duplicator to be added to the information on the duplicated punch card at an appropriate time.
  • the storage register is constructed from latch circuits controlled by a shift register. In this way, a received multidigit data signal can be stored and shifted in synchronism without the need for a plurality of coordinated shift registers.
  • a novel circuit is employed which automatically inserts error checking and framing bits into the bit stream for transmission with the meter reading.
  • the received data is monitored to prevent the presentation of erroneous data to the storage register and therefore the duplicated punch card.
  • FIG. 1 is a block diagram showing the basic system contemplated by this invention.
  • FIG. 2 is a block diagram of a central meter accessing and information receiving system embodying the principles of this invention.
  • FIGS. 30 and 3b are block diagrams showing details of the system shown in FIG. 2.
  • FIG. 4 is a block diagram of a meter reading circuit connected to a utility meter register which is employed in the system of this invention.
  • a punch card duplicator 13 is connected by a special purpose computer 14 to a data set 16.
  • the punch card duplicator 13 is a commercially available unit which individually reads a standard punched card and duplicates the card by punching the information thereon onto a blank punch card in accordance with a program normally applied to the machine in the formof a program punched card.
  • portions of the information on the first punch card i.e. a telephone number
  • the special purpose computer 14 which applies the telephone number through the data set 16 to the switching network 11.
  • the switching network 11 selects the particular meter location circuit 12a through 12: represented by the applied telephone number.
  • the particular meter location circuit 12a through 12z selected by the switching network 11 is energized by a signal sent thereto from the switching network 1 1.
  • the signal passes through a data coupler'17a through l7z to energize the associated encoding circuitry 18a through 182.
  • FIG. 2 shows the cooperation between the punch card duplicator 13 and the special purpose computer 14.
  • the punch card duplicator In operation when a punched card is being duplicated by the punch card duplicator and reaches a portion thereof indicating a telephone number, the punch card duplicator under programmed control'provides a signal on a lead 21 through or gate 25 to clock a shift register 22.
  • the punch card duplicator 13 applies a signal to an automatic calling unit 26 on a lead 27.
  • the automatic calling unit 26 then applies a clock signal via lead 28 and or gate to the shift register 22 to receive the number stored therein at a rate determined by the automatic calling unit 26.
  • the automatic calling unit 26 pulses out the telephone number in proper format for the data set 16 to apply it to the switching network 11.
  • the particular shift register 22 used is clocked through a first or gate 25 when it receives information and through a second or gate 15 when it is providing information.
  • Other conventional shift registers can be substituted for the shift registers which are clocked at a single clocking terminal without departing from the spirit of the overall system taught by this invention.
  • the shift register 22 shown in detail in FIG. 3b is used in the preferred em bodiment of this invention because additional benefits flow from the use thereof.
  • the switching network 1 see FIG. 1, energizes the particular meter location circuit 12a through12zrepresented by the supplied telephone number.
  • FIG. 4 shows in detail the encoding circuitry 18 and the meter contacts 19.
  • a signal is applied on a lead 31 which initiates operation of a clock 32 and a one shot 33.
  • the signal from the clock 32 is applied to a counting chain 34 which includes four flip-flops 36 through 39.
  • the clock 32 provides a signal of-2,240 hertz. Therefore, the output from the flip-flop 36 is a signal at a 1,120 hertz.
  • the output from the flip-flop 39 designated C is a signal of hertz.
  • the number of flip-flops 36 through 39 and the frequency of the clock 32 are selected to provide signal frequencies necessary for operation of the remaining circuitry. If other frequencies were selected, one would merely change either or both the frequency of the clock 32 and the number of flip-flops in the counting chain 34.
  • the 2,240 hertz signal and the 1,120 signal are employed as representations of ls and 0s in a frequency shift keying system for transmission back to the central accessing facility 10 over the switching network 1 1.
  • the output from the clock 32 is applied by a lead 41 to a modulating logic circuit 42 while the output from the flip-flop 36 is applied by a lead 43 to the modulating logic circuit 42.
  • the output from the cou nting chain 34 which is taken from the flip-flop 39 and designated C is used for clocking shift registers and other counting chains in the encoding circuitry 18. It should be clear that the timing generating circuitry including clock 32 and counting chain 34 and the modulating circuitry including the modulating logic 42 could be provided by the telephone company as part of the data coupler 17 or a special data set.
  • the output from the one shot circuit 33 is applied by leads 44 and 46 to reset by-stable circuits included in a scanning counter 47 and a meter signal shift register 48.
  • the shift register 48 is configured so that each stage is reset to a l condition rather than the normal 0" condition.
  • the scanning counter 47 includes three flipflops 49, 51, and 52 which act as acounting chain to count down cycles of operation of the shift register 48.
  • the output from the flip-flops 49 and 51 are decoded by four nand gates 53, 54, 56 and 57 to sequentially energize leads 58, 59, 61 and 62. I
  • the output from the third flip-flop 52 is employed to provide a gating signal to prevent transmission of information until a specified waiting interval has occurred to allow the switching network 11 to settledown.
  • the output of the flip-flop 52 is applied by a lead 63 through a nand gate 64, which forms a part of the modulating. logic circuitry 42.
  • an inhibit signal is applied by a lead 63 to the nand gate 64.
  • the nand" gate 64 thereby holds the nand gates 66 and 67 in predetermined states so that only one of the signals on the leads 41 or 43 are passed through 'or" gate 68 and thereby back to the data coupler 17.
  • the timing functions performed by the flip-flops 49, 51, and 52 could also be formed by shift register circuitry. If this were the case, eight shift register stages and a four-input or gate could be employed. The first four shift register stages would be connected to the or gate to provide the gating signal on the lead 63. Each of the remaining shift register-stages would be connected to one of the leads 58, 59, 61 or 62.
  • the nand gates 73 through 74 and 76 through 78 provide the 2 out of 5 code to the shift register 48 which then accepts the coded information therein, adds in error checking and framing bits and shifts the signal to be applied to the nand gate 64 at the rate determined by the C signal to energize the modulating logic circuit 42 for transmission of the frequency shift keyed signal back over the switching network 11 to the central accessing facility 10.
  • the shift register 48 is synchronized with the remaining circuitry by use of the properties of the 2 out of 5 code employed.
  • a three input nand gate 84 senses the output condition of three of the shift register stages 86 through 88 in the shift register 48 to detect three consecutive ls. The receipt by the nand gate 84 of these three consecutive ls energized it to provide a transfer signal on a lead 85 and the complement thereof on a lead 90. Since the one shot 33 initially sets each stage of the shift register 48 to contain ls a transfer signal will be initially present upon reset to load information from the first dial into the shift register 48 and advance the scanning counter 47 one count.
  • the complement of the transfer signal on the lead 90 is applied by a lead 95 to advance the scanning counter 47 one count upon the next occurrence of the C signal.
  • the signal on the lead 85 is employed to inhibit a plurality o and gates 89 and 91 through 94 which in normal operation interconnect the stages in the shift register 48 for normal shift register operation.
  • the signal on the lead 90 is at the same time employed to drive and gates 96 through 99 and 101 for transferring the information presented by the nand gates 73, 74, and 76 through 78 to five stages 102, 103, 104, 86 and 87 of the shift register 48. These five stages, therefore, now contain the 2 out of 5 coded information indicative of the reading of the particular dial being sampled by the scanning shift register 47.
  • each of the shift register stages is a JK flip-flop which will toggle when both of its inputs are high, remain the same when both inputs are low and transfer the information on its upper input to the upper output when the two inputs differ in response to a clock pulse.
  • each of the flip-flop stages have sufficient built-in delay to continue providing the l to the successive stage for a sufficient period of time to enable proper information transfer.
  • the signal on the lead is also applied as the upper input to the first stage 105 of the shift register 48 while the complement thereof on lead 87 is applied as the lower input which drives the stage 105 to have a zero at its upper output.
  • a 1 is applied by the shift register stage 87 to the upper input of the shift register stage 88 while the gate 106 inverts the low now being provided by the 3- input nand gate 84 to apply a l to the higher input thereof so that the stage 88 complements in response to the next C pulse thereby providing a l at the upper output thereof.
  • the last stage of the shift register 48, 107 is made to assume the 1 stage because a l is present at its upper input while a zero is present at its lower input when the C pulse arrives. Therefore, it is seen that immediately after transfer the first stage 105 of the shift register 48 contains a zero, the next five stages 102 through 104 and 86 and 87 contain the 2 out of 5 coded information, the stage 88 contains a O and stage 107 contains a 1.
  • the zero in the shift register stage 88 returns the three-input nand gate 84 to a high state and the signal on the lead returns to a low state thus inhibiting the scanning counter 47 from advancing further and insuring that a 1 rather than a 0 is now inserted in the first stage each time the C, pulse is applied thereto.
  • the gate 84 will not again assume a low condition while the information contained in the stages 102 through 104 and 86 and 87 are being shifted down the shift register 48. Again since the first stage 105 was driven to the zero condition during the transfer interval, this zero will pass through to the stage 107 before the three stages 86 through 88 will have all ls" therein. At this time, transfer will again occur as above discussed. This time, however, the information transferred will be from the next dial as selected by the scanning counter 47 which has advanced one count. It should be noted that each of the stages of the shift register 47 except the last one, 107, again contain all l s. The'data stored in the shift register 47 is transmitted as it is shifted into the stage 107. The stage 107 is employed to modulate the modulating logic circuitry 42 to provide either a signal of 2,240
  • the output of the modulatinglogic circuit 42 is applied to the data coupler 17 and is passed through the switching network 11 back to the central receiving facility. It should be noted that since a zero was initially in the first stage 105 of the shift register 48, the information coming from the modulating logic circuit 42 will be 0, which was transferred up from the first stage 105 and is in the stage 107 upon transfer, 1 is then injected into the last stage 107 upon transfer and then which is in the stage 88. These three. bits serve as framing and error checking bits. The next five bits transferred are the information bits which may then be processed at the receiving location to extract meter readings therefrom.
  • Each complete meter reading sent from a meter location 12 is a series of four 8-bit words.
  • Each of the four 8-bit words contains information relative to the position of one dial of the meter being read.
  • the first 3 bits of each 8-bit word areO-l-O; the next five bits are the information containing bits.
  • the information sent back from the meter location circuit through the data coupler l7 and the switching network 11 is processed firstby the data set 16 and passed onto the special purpose computer 14 (see FIG.
  • the data set 16 is equipped to recognize such responses as busy signal and no answer. Such responses are passed through the special purpose computer to be applied directly to the punch card duplicator 13.
  • the signals from the data set 16 are applied to the special purpose computer 14 on three leads, 108, 109 and 111.
  • an indication such as a busy response
  • a signal is present on leads 108 and 109.
  • THe signal on the lead 108 is passedby an or gate 112 to an external punch lead 113 which enables the punch card duplicator13 to punch information presented on a lead 114 onto the blank areaof the duplicated punch card still resting in the punch card duplicator 13.
  • the signal indicating a busy or no answer, or the like, is applied on the lead 109 and passed by or gate 116 to the lead 1 14.
  • the punch card duplicator 13 applies a clocking signal on a lead 20 to the or gate 15 which shifts information out of the shift register 22 onto lead 122 which drives the or" gate 116 to apply the decoded information to the lead 114.
  • the shift register 22 is employed to obtain information from the punch card duplicator for the pulsing out through the automatic calling unit 26 to the data set 16 and therefrom to the switch telephone network 11 and also to receive decoded information from the decoder 117 and apply it back to the punch card duplicator 13.
  • the information received from the data set 16 on the lead 111 is inverted by an inverter 123 and applied by leads 124 and 126 to a flip-flop 127 and a divide by 3 circuit 128.
  • the inverted information provided by the inverter 123 is applied to a serial to parallel converting shift register 129.
  • the shift register 129 is advanced by a clock signal provided on a lead 131 bya clock 132.
  • the clock 132 is energized by the flip-flop 127 when the first l is presented on the lead 111.
  • the signal transmitted from the meter location circuit began with 010 and was 8 bits long. Therefore, the first zero is not accepted by the shift register 129 but clocking begins when the first l is present. Therefore, there are only seven stages in the shift register 129.
  • the first five stages thereof contain the information sent from the meter in the 2 out of 5 code. Therefore, a signal from the last stage of the shift register 129 is applied by a lead 133 to actuate code converter 134 to read the information contained in the first five stages of the shift register 129 and provide the same information in binary coded decimal format on output leads 118a through 118d.
  • the gating circuitry 141 resets the circuitry shown in FIG. 3a and provides a signal to indicate improperly received information.
  • the error checking circuitry shown in FIG. 3a is not exhaustive but shown by merely way of example.
  • the three errors which are checked for by the circuitry 141 are the most common ones looked for and therefore would be employed in the preferred embodiment of this invention. However, where greater assurances of proper information are required other tests could be devised to double check or check for less likely errors.
  • Two of the circuits included in the circuitry 141 operate in response to the divide by 3 circuit 128.
  • the nand gate 142 checks to insure that a 1 has not reached the last stage of the'shift register 129 before three ls have been received on the input lead 1 11.
  • the divide by 3 circuit 128 normally provides a l to one input of the nand gate 142 so that if a 1 appears on the second input, which is connected to the last stage of the shift register 129, an output is applied by the nand gate 142 to an or" gate 143 which acts to reset the shift register 129, divide by 3 circuit 128, and the flip-flop 127 thus aborting the received cycle.
  • This signal may also be used to drive the card duplicator 13 for indicating an abort on the punch card to be duplicated.
  • the second nand gate 144 checks to see that four l s are not in the received signal. To this end the output from the divide by 3 circuit 128 is inverted by an inverter 146 and applied to the nand gate 144. The other input of the nand gate 144 is taken from the output of the inverter 123 so that a l is received on the lead 111 after the divide by 3 circuit 128 has indicated three l s having been received, an abort signal will be provided by the nand gate 144 to the or gate 143. At this time, it should be made clear that the inverter 123 is inserted in the circuit merely to maintain logical levels.
  • the third nand gate 147 is employed to check for three l s in a row. To this end, 3 inputs thereof are connected to 3 consecutive stages of the shift register 129 so that if three l s do occur in a row the nand gate 147 will provide the abort signal to indicate that the received cycle should be aborted.
  • circuitry shown in FIG. 3a merely receives the data from the data set 16, does a serial to parallel conversion and a code conversion to provide binary coded decimal information to the circuitry shown in FIG. 3b.
  • the or gate 24 is shown as four or gates 24a through 24d. Since the information being transferred is in binary coded decimal which contains four bits, the or gate function is provided by the or gates.
  • the lead 1 18 in fact carries four bits and is shown as leads 118a through 1l8b while the lead 23 is shown as leads 23a through 23d.
  • the output from the shift register 22 is shown as leads 122a through 122b.
  • the shift register 22 is in fact a four bit parallel shift register. Normally four coordinated shift register circuits would be required but in accordance with the teachings of this invention a single shift register 148 having six stages 148a through 148f in cooperation with six four-channel latch circuits 149a through 149f perform the function of a four-channel shift register.
  • a latch circuit such as the latch circuits 1490 through 149f are commercially available items which each have four input terminals designated 151 through 154 and four output terminals designated 156 through 159 and a control terminal 161.
  • each of the inputs 151 through 154 is conductively connected to one of the outputs 156 through 159 respectively.
  • a second digital level is applied to the control terminal 161
  • the input terminals 151 through 154 become electrically isolated from the respective output terminals 156 through 159 and the signal level which was incident upon each of the input terminals 151 through 154 is stored on the respective output terminal 156 through 159 which that input terminal has been conductively engaged with.
  • the latch circuits 149a through 149f are connected in cascade with each of the output terminals 156 through 159 of the latch circuits 149a through 149e connected to one of the input terminals 151 through 154 respectively of each of the latch circuits 14% through 149f.
  • the input terminals 151a through 154d of the latch circuit 149a are connected to the outputs of the or gates 24a through 24d.
  • the output terminal 156f through 159f of the last latch circuit 149f serve as the output terminals of the four channel shift register 22 and are connected therefore to the leads 122a through 122d.
  • each of the latch circuits 149a through 149f is controlled by the single channel shift register 148 which normally contains all zeros therein so that a conductive path exists between the input terminal 151a through 154a to the output terminals 156f to 159f respectively.
  • the four bit data signal is applied, for example, on the leads 1180 through 118d and a pulsed write signal is applied on the lead 119.
  • a pulsed write signal is applied on the lead 119.
  • Each time a pulse is applied to the lead 119 it is transmitted through the or gate 25 to insert a l into the shift register 148 when a shift pulse is applied to lead 162.
  • the output of the or gate 25 initiates the shift pulse by driving a delay circuit 161 which in turn drives the or gate 15.
  • a l is inserted into the stage 148a leaving the remaining stages 148b through 148]" with zeros therein.
  • the 1 in the stage 148a toggles the latch circuit 149f at its control terminal 161f rendering the four channels therein non-conductive and storing the data presented on the leads 118a through 1 18d at the output terminals l56f through 159f of latch circuit 149f.
  • the ls inserted into the shift register 148 are advanced therein by the clock signal provided in response to signals from the or gate 25 to the delay circuit 161, or gate 15 onto lead 162.
  • the clock signal is again applied on the lead 162 to advance the l previously in the stage 1480 to the stage 148b and a new 1 is inserted by the or" gate 25 into the stage 148a.
  • the latch circuit l49e is rendered non-conductive so that the signals which were applied to leads 118a through 118d are stored at the output terminals 156e through 159e of the latch circuit l49e.
  • the next latch circuit from right to left is rendered non-conductive to store the presented four bit data word.
  • the multichannel shift register 22 can also be provided with information by providing four bit data words on the leads 23a through 23b and a pulse on the lead 21.
  • the latch circuits 149a through 149f under the control of the single channel shift register 148 effectively serves the function of a multichannel shift register. It should be further noted that such a shift register is superior in performance to a normal multichannel shift register in that the number of stages apparently present can be changed without physically altering the circuit. Therefore, if only four four-bit data words are to be employed in the shift register which contains six stages, information can be entered in the last four stages and then read out without the need to spend the time of shifting through the extra two stages.
  • the fourth stage of the single stage shift register 148e is tapped off and connected to the lead 121 to activate the punch card reader duplicator.
  • a system for interrogating and receiving information from a plurality of remote devices connected to a plurality of numbered telephone lines in a switched telephone network said system including:
  • a storage register having an input terminal, an output terminal and a control terminal, said storage register being responsive to a control signal applied to said control terminal for storing data signals applied at said input terminal and providing data signals stored therein at said output terminal in a sequential mode;
  • a punch card duplicating means for transferring information including a number of one of said telephone lines from a first punch card to a second punch card and providing l) a data signal indicative of said number of said one of said telephone lines to said input terminal of said storage register (2) a control signal to said control terminal and (3) a transfer signal indicating that said data signal indicative of said number of said one of said telephone lines has been provided, said punch card duplicating means being responsive to a punch signal for applying a control signal to said control terminal and punching information supplied on an information receiving terminal onto said, second punch card;
  • an automatic calling means responsive to said transfer signal (1) for applying a control signal to said control terminal of said storage register, then (2) receiving said data signals sequentially from said storage register and (3) outpulsing said data signals onto said line terminal means;
  • first and second latch circuits each having an input point, an output point and a control point; said first and second latch circuits each being responsive to a first signal condition at said respective control points for providing a conductive path from said respective input points to said respective output points and to a second signal condition at said respective control points for providing a nonconductive condition between said respective input points and said respective output points, said first and second latch circuits being further responsive to said signal condition at said respective control points changing from said first signal condition to said second signal condition for maintaining the signal condition at said respective output points not withstanding further changes in the signal condition at said respective input points until said signal condition at said respective con-v trol points revert to said first signal condition;
  • said shift register has one stage for each latch circuit, each of said shift register stages being connected to a control point of one of said latch circuits.
  • an N" stage shift register for storing and shifting data bits in the form of ls and Os, N being an integer of three or more, said shift register being responsive to a clock signal for receiving applied data bits into a first of said N stages and advancing data bits stored in each of said N stages to a next succeeding stage; said shift register being further responsive to a transfer signal for receiving data bits in parallel into two or more of said N stages and inserting a predetermined data bit into a predetermined one of said N stages, said bits received in response to said transfer signal overriding said bits advanced by said clock signal;
  • means for providing said data bits in parallel, said data bits in parallel providing means including:
  • switched telephone network having first and second access points
  • a storage register having an input terminal, an output terminal and a control terminal, said storage register being responsive to a control signal applied to said control terminal for storing data signals applied at said input terminal and providing data signals stored therein at said output terminal in a sequential mode;
  • a punch card duplicating machine for transferring information including a number of one of said telephone lines from a first punch card to a second punch card and providing l) a data signal indicative of said number of said one of said telephone lines to said input terminal of said storage register (2) a control signal to said control terminal and (3) a second transfer signal indicating that said data signal indicative of said number of said one of said telephone lines has been provided, said machine being responsive to a punch signal for applying a control signal to said control terminal and punching information supplied on an information receiving terminal onto said second punch card;
  • an automatic calling unit responsive to said second transfer signal (1) for applying a control signal to said control terminal of said storage register, then 2) receiving said data signals sequentially from said storage register and (3) outpulsing said data signals to said second access point of said switch telephone network;
  • said storage register includes:
  • first and second latch circuits each having an input point, an output point and a control point; said first and second latch circuits each being responsive to a first signal condition at said respective control points for providing a conductive path from said respective input points to said respective output points and to a second signal condition at said respective control points for providing a nonconductive condition between said respective input points and said respective output points, said first and second latch circuits being further responsive to said signal condition at said respective control points changing from said first signal condition to said second signal condition for maintaining the signal condition at said respective output points not withstanding further changes in the signal condition at said respective input points until said signal condition at said respective control points revert to said first signal condition;
  • l 16 means for connecting said output point of said first and second latch circuit during a first time interlatch circuit to said input point of said second latch val, (2) said first signal condition to said control circuits said input point of said first latch circuit p nt of aid fi t atc ircuit and said se nd s rvi a id input i l;
  • d 1 means signal condition to said control point of said conresponsive to n- 1 signals applied to i 5 trol point of said second latch circuit during a third trol terminal for successively applying l said first intervalsignal condition to said control points of said first

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002837A (en) * 1975-09-17 1977-01-11 Houston Natural Gas Corporation Transceiver
US4135181A (en) * 1976-01-30 1979-01-16 General Electric Company Automatic remote meter reading and control system
EP0305630A2 (en) 1982-06-10 1989-03-08 M & FC HOLDING COMPANY, INC. Data accumulator and transponder
US5841845A (en) * 1996-12-18 1998-11-24 Lucent Technologies Inc. Dialing plan for special access applications such as telemetry systems

Citations (1)

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Publication number Priority date Publication date Assignee Title
US3582896A (en) * 1965-01-22 1971-06-01 Bell Telephone Labor Inc Method of control for a data processor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582896A (en) * 1965-01-22 1971-06-01 Bell Telephone Labor Inc Method of control for a data processor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002837A (en) * 1975-09-17 1977-01-11 Houston Natural Gas Corporation Transceiver
US4135181A (en) * 1976-01-30 1979-01-16 General Electric Company Automatic remote meter reading and control system
EP0305630A2 (en) 1982-06-10 1989-03-08 M & FC HOLDING COMPANY, INC. Data accumulator and transponder
US5841845A (en) * 1996-12-18 1998-11-24 Lucent Technologies Inc. Dialing plan for special access applications such as telemetry systems

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AU3537471A (en) 1973-05-10
FR2120766A5 (OSRAM) 1972-08-18
GB1342844A (en) 1974-01-03

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